On the host of each Connection Manager, add a group entry
for the group of database server and add a group entry for the group
of DRDA aliases. Add group
options to the database server and DRDA alias
entries. Use the c=1 group-entry option so that connection-attempt
starting points in the list of group members is random. Use the e=last_member group-entry
option so that the entire sqlhosts is not scanned
for group members. For example:

On the host of each IBM Data
Server client,
create sqlhosts file entries for each service-level
agreement (SLA) in each Connection Manager configuration file. Create
group entries for each group of SLA entries, and add group options
to the SLA entries.

In the previous example, IBM Data
Server client
connection requests to @g_primary_drda are sent by drsoctcp protocol
to one of the Connection Managers. The Connection Manager that receives
the request uses an SLA to provide the client application with connection
information for the primary server.

If you receive error -23104
when accessing the server through the DRDA protocol,
the client application might be trying to bind a value that has an
encoding different from the code page or code set of the database
locale. Set the GL_USEGLU environment variable
to 1 before you start the Informix instance.
This setting enables the server to initialize the appropriate Unicode
converters that are required to handle the code set conversions.